Previous Post : Here
Manage to get a makeshift mandrel and did a quick flare for the funnel standpipe. Its not pretty and this the best I could achieve for now.
Side by side comparison to the one that I presently use. I tried to get the inlet as wide as possible.
Almost there, but the tapper is shallow and over a longer neck distance as compared to the ready made adapter.
I use this wooded stick above that available in local hardware for use with gardening tools as a mandrel. I need to make the tapped part more so that it will create a shorter transition from the bigger diameter to the smaller. Where is a Tobasco bottle when I needed one.
I use hair dryer to heat up the PVC pipe and gently press it against the mandrel. Constant reheating required to prevent PVC harden. A slow process, I don't have a heat gun other wise it could be much quicker. Heat produce by a hair dryer isn't industrial strength, but it does work.
Above the 25/20 adapter standpipe and below the home made flared standpipe. It remind me of trumpet and I need to make it wider, for now its okay.
Below is the water inflow where it start to flush.
This next picture below, water inflow that it will be able to stop.
Starting water is less that the stopping water, this will make it possible for make it operates somewhere in between these two inflow. A short test shows that the water inflow it able to stop is about 2x the minimum siphon starting inflow water. This is a good indication that it may be able to work.
I suspect the longer neck of this trumpet making transition very gradual lessen its effectiveness. I must try to make it broader and shorter neck as illustrate above.
Continue : Here